DSCM: A Data Stream Checking Mechanism for Copy-on-Change in Local Data Protection Application
Jiangjiang Wu, Yong Cheng, Zhiying Wang, Songzhu Mei, Jie Zhou · Procedia Engineering · 2011
Data protection has played an important role in maintaining the continuity and correctness of data processing application. We have designed the data protection architecture with data stream checking mechanism (DSCM) for copy-on-change. When the upper application requests a write to the disk, the DSCM computes the hash value of the data block by input the data stream in memory, and then compares the hash value with the pre-stored value, which has been generated in last data write request, in order to determine whether the data block need to be backup again. The experiments result shows that the DSCM can significantly reduce the disk storage overhead.